Aoticloggikg jsevice fob pulverizeb-fuez



I A. 0'. HEYL JQ A NTICLOGGING DEVICEFOR PULVERIZED FUEL CONTROLLERS'.

APPLICATION FILED JAN- 23.. I915.

Patented Aug. 1,1916.

2 SHEETS-SHEET X.

nmnm 1 A.D.HEYL. ANTIQLOGGING DEVICEFOR PULVERIZED FUEL CONTROLLERS. I APPLICATION FILED ,JAN.23| l9l5-,- A 1 93,01 PatentedAug, 1,191

2 SHEETSSHEET 2.

ALBIJRT HEYL, OF NEW YORK, ZN. Y.,-ASSIGNOR TO QUIGLEY FURNACE AND FOUNDRY COMPANY, A CORPORATION OF MASSACHUSETTS.

ANTICLOGGING bEVICE FOB PULVERIZED-FUEL CONTROLLERS.

Patented Aug. 1916.

Application filed January 23, 1915. Serial No. 4,032.

I To all whom it concern themagazine along a conduit to be dropped be placed in the magazine over 1% 1: return screw,

Be it known that I, ALBERT D. HEYL, a citizen of the United States of America, residing at New York city,.county and State of New. York, have invented certain new and useful Improvements in iinticlogging Devices for lulverized-l 'uel Controllers, of which the following is a specification.

IMy invention relates to mechanism for feeding finely divided material, such as pul' verized coal, and comprises an attachment designed to be applied to apparatus of a standard type employed for this purpose. and which greatly facilitates its operation.

A. standardtype of mechanism, known as a controller, for feeding pulverized coal to furnaces comprises a magazine or chamber to which the pulverized coal is deliveredby ahopper or}. equivalent device, a feed screw conveyor which rotates continuously and forcesa regulated quantity of the coal from infi'pnt of a transverse air blast which picks up as mu furnace, while the surplus drops below the air blast, and is returned to the magazine by an upwardly inclined return screw con veyer operating in a second, and lower con duit. The material so returned to the mega zine meets the downwardly vand outwardly flowing currents of material being produced by the action of the upper feed scrgw conveyer, andthe two currents jam together in struggling, twisting masses, the friction of which, one uponanother, absorbs a great deal. of powerunneccssarily.

I have discovered that if a suitable shield the rear end of the feed screw and the delivery end of the the currents or material flowing downwardly from. the hopper are deflected from the first few turns of the thread on the feed screw, and that portion of the screw is left free to receive the returning material from the return screw conveyer, so that it may readily seize said material and driveit out again across the magazine in unison with the downwardly flowing cur "rents from the hopper.

16, the

h of he coal as it can carry to the.

magazine.

known to me embodying my invention is illustrated in the accompanying two sheets of drawings in which Figure 1 is a vertical central section. of a. standard form of controller with my invention applied thereto, the hopper being partly broken away; Fig. 2 is a cross section and and Fig. 3 is a. detail perspective view of the attachment constituting my invention.

Throughout the drawings like reference characters indicate like parts.

1, is the casing of the controller, and 2,' the magazine surmounted by the hopper 3. A feed screw conveyor 4, extends across the magazine and out through a feed conduit 14, at the front of the magazine. From converse air blast passing out through opening ,surplus material not carried ofi by the air screw 5, through the lower and upwardly inclined conduit 15, to the magazine. Conduit 15, is parallel to the inclined bottom 11?, of the magazine, and extends partway into the magazine, continuing nearly to the rear wall thereof as a U-shaped channel 9. The two conveyor screws are rotated in unison by intergearing 6, and driven by electric motor 8, through gearing 7, The fore going is a brief description of a standard form of controller 'inmccessful use for a 1 front elevation on the line 2-2 of Fig. 1, I

. duit 14, the material drops acrossa transblast'being returned by conveyorv number of years, but r heretofore subject to the disadvantage that the outgoing and return currents of material jam together around the feedscrews in the lower part of the hopper and clog the action of the same so that a large percentage of the power 18 l i always. consumed in overcoming inte friction, especiallyfwhen the air blast is re duced in force and the volume or surplus material returned to the magazine is 'corw spondingly large. v

Accordingto my invention, 10, is a shield, preferably of an inverted U-shape as shown, placed over the rear end of the feed conveyor 4, and over the delivery end of the return conveyer 5, and over the U-shaped channel 9, in whichit lies. This shield extends back to and in contact with the rear wall of the Preferably it has its upper surface inclined upwardly and backwardly to meet said rear wall at an angle as shown, and has laterally extending wings 11, 11, inclined to fit the inclined bottom 17, of the zontally from its front end, a feed screw magazine. 4 These wings may have bolt holes 12, 1.2, through which bolts 13, 13, may pass to hold the shield in place, or other attachinqmeans maybe used.

n operation, the first one or two turns of the screw thread on feed conveyer 4, being under shield 10, are not reached by the currents of fresh material flowing down from hopper 3, but are left free to receive the returned material driven up along channel 9, by return screw conveyer 5. lhis re turned material is thus picked up easily by the feed screwand'forced out from under the shield Without meeting any opposing currents. As it issues from under the shield, the currents of new material sliding down the inclined outer surface of the shield mingle readily with it and the whole mass is driven across to conduit 14, without jamming or packing together unnecessarily. The use of this simple attachment in some cases reduces the consumption of current needed to drive the controller to one third or less of the amount required to operate it before my invention was applied.

Having described my invention, 1 claim: I. In an apparatus for feeding finely divided material the combination with a magazine having a forwardly anddownwardly inclined bottom, a conduit extending horiconveyor extending across the magazine and outthrough said condult, a second conduit extending from the front end of said magazine parallel to said bottom, terminating in a channel of U-shaped cross section in said bottom at the rear of the magazine, and a return screw conveyor in said inclined conduit and channel, of an inverted U-shaped shield adapted to be bolted to the inclined bottom. of the magazine in contact with the rear wall thereof over the U-shaped channel and the ends of both conveyer screws.

2. In an apparatus for feeding finely di- .vided material the combination with a magazine having a forwardly. and downwardl inclined bottom, a conduit extending horizontally from its front end, a feed screw conveyor extending across the magazine and out through said conduit, a second conduit extending from the front end of said magazine parallel to said bottom, terminating in a channel of U-shaped cross section in said bottom at the rear of the magazine, and a return screw conveyor in said second eon duit and U-shaped channel, of an inverted Ushabed shield adapted to be bolted to the ainclined bottom of the magazine in contact with the rear wall thereof over the U-shaped .channel and the ends of both conveyer screws, said shield having its upper surface inclined in thesame direction as the bottom of the magazine.

ALBERT D. HEYL. \Vitnesses M. (l. CRAWFORD, J B. SonMrr'r. 

